Process for preparing calcimine compositions.



UNITED STATES PATENT OFFICE.

HERBERT H. CHURCH, OF BELLOWS FALLS, VERMONT, ASSIGNOR TO CASEIN COMPANY OF AMERICA, A CORPORATION OF NEW JERSEY.

PROCESS FOR PREPARING CALCIMINE COMPOSITIONS.

Specification of Letters Patent.

Patented Nov. 28, 1905.

Application filed April 14, 1904. Serial No. 203,181.

To all whom it may concern:

Be it known that I, HERBERT H. CHURCH, a citizen of the United States, residing at Bellows Falls, in the county of Windham and State of Vermont, have invented or discovered certain new and useful Improvements in Processes for Preparing Calcimine Compositions, of which the following is a specification.

This invention or discovery has for its object the production of a dry calcimine composition containing animal glue, which can be made ready for use simply by adding cold Water to the dry comminuted compound.

In accordance with the present invention or discovery the glue Which is to be employed as a binder in the calcimine composition is first dissolved in, preferably, about three or four parts of hot water. When the glue has thus been perfectly dissolved, the glue solution is evaporated by subjecting the same to the action of heat on a metallic surface at a temperature of not less than 212 Fahrenheit until it is dried in a thin film or films. It is then removed from the heated surface and reduced to a fine powder. This evaporating operation is preferably performed on a wellknown form of drying-machine containing one or more hollow rotating metal rolls or cylinders heated by steam and so arranged,

if a single roll or cylinder be employed, that the same may dip into the glue solution as it is being slowly rotated, or if two such cylinders be employed they may rotate in contact with each other, turning toward each other, and the glue solution be introduced into the pinch between the two rolls. The rolls or cylinders employed are preferably about twenty-eight or thirty inches in diameter and will preferably rotate about six or seven times a minute when heated by a steam-pressure of about forty-five pounds to the square inch. The surface temperature of the rolls should not exceed about 170 to 180 F ahrenheit. The dried films of glue are removed from each of the rolls, before a complete rotation has been performed, by stationaryscrapers held in yielding contact with the rolls, and these dried films of glue are subsequently reduced to a fine powder by grinding or otherwise. The dried films of glue thus produced at a partial rotation of a drying roll or cylinder are exceedingly thin and when broken or crumbled produce a light fluify powder quite different from pulverized glue produced by grinding or otherwise comminuting dried glue in other forms, this fluffy comminuted glue being readily and quickly soluble in cold Water, so that the calcimine com position containing this fiuf'fy glue-powder can be prepared for use simply by adding cold water to the dry comminuted calcimine compound, as above stated.

To produce the novel calcimine composition, about six or seven parts of the pulverized glue, prepared in the manner just described, is thoroughly mixed with, preferably, about fifty parts of pulverized whiting and fifty parts pulverized talc, when the calcimine composition will be readyfor use. Instead of the proportions just stated of Whiting and talc, one hundred parts of each or of china-clay or other suitable mineral or earthy base may be employed.

For some uses it has also been found advantageous to add to the glue solution, before drying it out, a quantity of ordinary laundrysoap dissolved in water in a proportion of about eight pounds of soap to one hundred pounds of dry glue, the soap giving the desirable flowing and spreading qualities to the calcimine when it is applied with a brush to plastered surfaces.

The invention is not to be understood as being limited to the exact proportions as above stated of the ingredients of the novel calcimine composition, as the proportions of said ingredients may be varied somewhat without departing from the invention.

Having thus described my invention or disco very, I claim and desire to secure by Letters Patent 1. The herein-described process of producing a calcimine compound, consisting in dissolving animal glue with Water by the aid of heat, then evaporating the glue solution into thin films, then pulverizing said films, and then mixing the pulverized glue with a suitable proportion of a mineral or earthy base, as talc or Whiting, or both.

2. The herein-described process of producing a calcimine compound, consisting in dissolving animal glue with water by the aid of In testimony whereof I afiix my. signature in presence of tWo Witnesses.

HERBERT H. OH URCH.

Witnesses:

LoUIs H. SMITH, A. F. GRIeNoN. 

